>>36186275>>36186383Considering it's not possible to pull off a generation-contained 3-stage non-starter Fire line with the exception of the Chandelure line in Gen 5, you're going to be forced to work with 2-stage lines.
Also
>>36185540 I think Horsea is a great option for Gen 1. I like Slowpoke too, especially if living by the amphibious trend Water starters typically abide by. For Fire, I like Houndour, Litwick, and Litleo. For Grass, I'd probably diverge from your choices and go with Seedot and Skiddo.
